Sandless bender



Aug. 12, 1941. H. a. CLOYD SANDLESS BENDER Filed May 13, 1939 2 Sheets-Sheet 1 1941- I H. s. CLOYD V 2,252,491

SANDLES S BENDER Patented Aug. 12, 1941 UNITED STATES PATIENT OFFICE 2,252,491 SANDLESS BENDER Hance G. Cloyd, Toppenish, Wash.

Application May 13, 1939, Serial No. 273,547

1 Claim.

This invention relates to a pipe bending device.

An object of the invention is the provision of a device for bending pipes without the use of a core of sand or other suitableagent to prevent fracture or collapse of the pipe when bent, a head cooperating with a bending jaw in such a manner that an unnecessary depression at the inner portion of the bend will not be had while means is employed to take care of a slight shrinkage during the bending of the pipe.

A further object of the invention is the provision of a devicefor bending pipes in which one end of the pipe is held against slippage while the remaining portion of the pipe is either bent at an angle to its former position, or in parallel relation with the part that is being held without any undue depression being formed at the inner portion of the pipe where it is bent with tracks for guiding the bending jaw around a bending head while preventing the bending jaw from lateral slippage during the operation.

A further object of the invention is the provision of a device for bending pipes in which a freely removable bending jaw is moved around a bending head with the pipe being located between the bending head and jaw, thebending jaw being held in operative position by a movable handle and cooperating tracks between the jaw and head.

This invention will bebest understood from a consideration of the following detailed description, in view' of the accompanying drawings forming a part of the specification; nevertheless, it is to be considered that the invention is not confined to the disclosure, being susceptible of such changes and modifications as define no material departure from the salient features of the invention as expressed in the appended claim.

In the drawings:

Figure 1 is a view in perspective of a pipe bending device constructed according to the principles of my invention.

Figure 2 is a plan view of the bending device.

Figure 3 is a horizontal section taken along the line 3-3 of Figure 4.

Figure 4 is a side View in elevation of the bending device.

Figure 5 is a vertical section taken along the line 5-5 of Figure 3.

Figure 6 is a view in perspective of a yoke which supports an operating handle to the bending jaw.

Figure 7 is a view in perspective of the operating handle.

Figure 8 is a view in perspective of the loosely mounted bending jaw.

Figure 9 is a plan' view of a bending pipe.

Figure 10 is a side view in elevation of the bending head in detached relation.

Figure 11 is a transverse vertical section taken along the line III-I0 of Figure 9.

Referring more particularly to the drawings, ID designates a block to which a base member II is bolted. Rising from the base member is a standard I2 upon which is mounted in any approved manner a bending head I3.

A clamping member I4 is adapted to engage a flat side of the head I3 and is held in position by an L-shaped clamping member I5 having a vertical arm I6 and a horizontal arm I! which has its free end in engagement with the standard I2. The upper end of the arm I6 is provided with a rounded portion I8 which is adapted to engage the outer face of the clamping member I4.

A threaded bolt 20 extends through openings 32 and 2| respectively formed in the thickened portions of the arm I6 and standard I2. A spring 23 embraces the bolt 20 between the arm I6 and the standard I2 and exerts an outward pressure upon the arm I6. A wing nut 24 is threaded onto the outer end of the bolt 20 and engages the outer face of the standard I2 for drawing the clamping member I5 into operative engagement with the standard I2 and the pipe clamping member I4.

It will be noted that the clamping member I4 is provided with a semi-circular groove 25 which is complementary to a semi-circular groove 26 in the head I3 to receive a pipe 21 so that when the nut 24 is drawn up tight on the threaded bolt 20 the pipe will be clamped onto the head I3.

Referring more particularly to Figure 3, it will be seen that the groove 26 of the clamping head extends around one end as shown at 28 and then around the opposite side as shown at 29. Teeth are formed along this semi-circular groove for aiding in holding the pipe in position. The portion 28 of the groove is formed along an arc of a circle having its center at 3!]. The outer edges of the portion 28 of the groove are cut-away as shown at 3| in Figures 4 and 10. The outer faces of the walls are cut off at an angle as shown at 32 for a purpose which will be presently explained.

The head is provided with a vertical passage 33 which has its axis as indicated at 34 and inwardly of the center 30. The distance between the two points 30 and 34 is equal to the width of that portion of the walls of the groove 28 which has been cut-away and the cut-away portion is indicated between the dotted curves 35 and 36 in Figure 3. The cuts form the cooperating tracks 3| and 32 at opposite sides of the groove.

A yoke generally designated by the numeral 31 consists of a pair of arms 38 and 39 which are connected together by the bridging members 40 and 4 I. The outer free ends of the arms are provided with alined passages 42 which are received by a tapered pin 43 which is forced through the passages 42 and in the passage 33 formed in the bending head l3. The arms 38 and 39 are also provided with alined passages 45 to receive a pin head 5| having a pocket 52 in which is rotatably mounted a roller 53 carried by pintles 54 which project throughopenings 55 formed in the side walls of the pocket 52. The head 5| is alsoprovided with a passage 56 which receives :the pin 46 for pivotally mounting the. operating: handle 50 within the yoke 31.

A bending jaw '60,. shown more particularly in Figure 8, is provided: witha longitudinalgroove 6| which is adapted to. receivethe pipe 21 as shown in Figures 1 and 2. This bending jaw is provided with tracks. 62.and angular disposed tracks 63 and the tracks 62 .and 63 are formed complementary to the tracks 3|, and 32 on the bending head so that when the jaw 66 is forced into bending relation with. the pipe 21 these tracks will cooperate to prevent lateral movement of the bending jaw. Itwill be seen more particularly fromFigure 2 that the jaw 60 is unconnected with any other part of the device and is merely slipped into position on the pipe 2'! with the roller 53 resting. upon the outer fiat face 64 of the jaw.

The head I 3 is provided with an opening 65 which receives a squared reduced end 66 on the upper end of the standard l2. .A setscrew 6! threaded into a passage 68 engages the reduced portion 66 and removably secures the head l3 to the upper end of the standard l2.

The operation of my deviceis as follows: .A pipe as shown at 21 is clamped between the head |3 and the member l4 within the complementary formed grooves 25 and 26 respectively formed in the head I3 and member l4. bending jaw 60 is then placed in position as shown in Figures 1 and 2 and the handle 50 is moved inwardly so..that the roller 53 will bear against the flat face 64 of the jaw 60. The device is now ready for the bending operation.

When the handle is turned in the direction indicated by the arrow in Figure 2, the roller which presses upon the jaw 60 will force said jaw in a rolling movement around the outer end The.

of the bending head It and the pipe 21 will be turned around the bending head with the tracks 62 and 63 cooperating with the tracks 3| and 32 respectively for guiding the bending jaw through a definite path and the pipe will be accordingly bent with a slight depressed area as shown at 10 in Figure 9 being formed at the outer face of the bend. The cooperating tracks 3| and 32 and 62, 63 will prevent creasing or scoring of the sides of the pipe where the bending jaw and head meet.

It will be noted that the pin 43 is eccentrically located with respect to the center of the circle which includes the curved portion 38 and this eccentric mounting of the pin and likewise the yoke 31 will cause the slight depressed portion 10 of the bent pipe 21, while the inner face of the bent portion of the pipe as shown at M will follow the true are of a circle as shown at 28 in Figure 3.

With such construction the pipes may be bent with facility without causing any cracks or breaks in the pipe where it is bent and without decreasing materially the capacity of the pipe.

The parts are readily assembled by placing the legs or arms 38 and 39 of the yoke 31 at opposite sides of the bending head l3 after which the pin 43 may be inserted. Since the bending jaw 60 is freely removable the parts of the device may be readily assembled or disassembled with facility.

I claim:

In a pipe bending device having a stationary bending block and a movable tube bending member, said movable bending member comprising a yoke consisting of a pair of spaced arms, a pair of spaced bridging members connecting a pair of the ends of the arms together, the arms between the spaced bridging members being provided with aligned passages, a pin mounted in said passages, a handle having a curved head, the end of the head located between the bridging member and having a passage received by the pin, the head having a pocket, a roller rotatably mounted in the pocket and having a portion projecting beyond the pocket, the arms straddling the stationary block, means pivotally mounting the free ends of the arms on the stationary block, and a bending jaw removably fitted between the arms of the yoke and provided with a groove at one face to receive the pipe to be bent, the projecting portion of the roller engaging the opposite face of the jaw, a line passing through the pivot of the yoke and axis of the roller forming with a line passing through the pivot of the yoke and pivot of the handle forming an acute angle so that inward pressure on the handle will provide a line of force acting on the bending jaw and passing through the axis of the roller and to one side of the axis of the yoke.

HANCE G. CLOYD. 

